Echidna
All About Monotremes
Egg-laying mammals with a knack for electricity – discover all the unique abilities of monotremes!
What Are Monotremes?
Monotremes are mammals that stand out from all other mammals: they do not give birth to live young. Instead, they lay eggs from which their offspring hatch. This is why they are also referred to as egg-laying mammals. They share a common body opening for both their eggs and waste: the cloaca.
Main Characteristics of Monotremes
1. Egg-Laying Mammals
Monotremes are truly one of a kind. Even though they are mammals, they lay eggs. Platypuses build a nest to incubate their eggs. In contrast, echidnas keep their eggs in a pouch – similar to marsupials. Just like birds, the young of monotremes have an "egg tooth" that helps them break through the shell.
2. Cloaca
Unlike all other mammals, monotremes possess a cloaca. This is the body opening where both reproductive and excretory organs converge. All other mammals have separate "openings" for these functions.
3. Low Body Temperature
Monotremes have a surprisingly low body temperature and a slow metabolism. They evolved from reptiles and have retained these traits to this day. The advantage is that they require less food and expend less energy. The downside is that they are generally slower and have lower endurance.
4. Electroreception
Monotremes possess sensory cells that allow them to detect electric fields. In echidnas, these cells are located in the nose, while in platypuses, they are found in the bill. Since all living beings generate electric fields, this ability helps them locate prey.
Monotreme Family Tree
Amazing Facts About Monotremes
- There are only five species of monotremes: the platypus and four species of echidnas (one short-beaked echidna and three long-beaked echidnas).
- Monotremes are the only mammals that don't give birth to live young. They lay eggs.
- Monotremes means „single opening“ in Greek and refers to their unique anatomy. They have a single exit for both reproductive and excretory systems. It is called the cloaca. This is different from all other mammals that have separate openings.
- Monotremes are carnivores.
- Monotremes possess an electro-sense, allowing them to detect the electrical signals emitted by other living creatures using their snout, bill or beak.
- Monotremes have a noticeably low body temperature. It is 86-89 degrees Fahrenheit (30-32 degrees Celsius).
- Monotremes live in Australia, Tasmania and New Guinea.
